Comparación de esfuerzos tensiles y compresivos entre un modelo de cantiléver con implantes y otro con dientes natura/es como pilares, mediante el método de elementos finitos. CES Odont 1995; 8:109-115.Se generó un modelo matemático tridimensional que representaba una prótesis parcial fija de tres unidades Con un póntico en cantiléver y sus estructuras mandibulares de soporte. Uno de los modelos tenía dientes naturales (primeros premolares) y el otro implantes óseointegrados como pilares, ambos con un póntico Posterior en cantiléver. Por medio del análisis de elementos finitos se realizaron cálculos de distribución de esfuerzos cuando se le aplicó a los modelos una carga de 26.7 kg de magnitud en nueve diferentes condiciones (dirección y cantidad).— Los resultados mostraron tina diferencia importante entre el comportamiento de ambos modelos, la cual se atribuyó a la elasticidad del modelo con dientes naturales debida a la presencia de Ligamento periodontal y dentina, mientras que el modelo de implantes era más rigido por la carencia de esos elementos. Por tanto, se puede afirmar que el modelo de dientes naturales es biológicamente más aceptable. Mientras que el de implantes lo es mecánicamente. ABSTRACT Comparison of tensile and compressive stresses between a model of cantilever with implants and another one with natural teeth as abutments, by means of the finite element method. CES Odont 1995; 8:109-115.A three-dimensional mathematical model was generated representing a three unit cantilever fixed partial denture and its supporting mandibular structures. Both models had a posterior cantilever pontic with one of them using natural abutment teeth (premolars) while the other one used implants. By means of a finite element analysis, calculations were made for stress distribution under fine different quqntitative and direction conditions when subjected to a 26.7 kg load magnitude.- The results showed that there was an important difference between both models which could he altributed to the elasticity of the natural tooth model, given the presence of periodontal ligament and dentin. In comparison with the rigid structure of the implant model. It was therefore concluded that the natural tooth model was more biologically acceptable while the implant model was more mechanically acceptable.

Altered Passive Eruption (ape) is a condition that can significantly affect achievement of the aesthetic goals of orthodontic treatment. Although this condition is known to orthodontists, most do not recognize the difference in its classification and manage- ment. The aim of this article is therefore to describe the guidelines for accurate diagnosis, explain the treatment and establish a mana- gement protocol for ape that would indicate when such patients are to be referred for plastic periodontal procedures, based on clinical findings and considering age as a critical factor when determining the procedure.

Tooth extraction due to the need for space for orthodontic treatment in many cases causes changes in the alveolar ridge, which can result in functional and aesthetic problems for the successful completion of treatment stemming from an insufficient amou- nt of bone tissue. This problem requires the specialist to analyze each individual clinical situation and consider a number of factors specific to the patient, the treatment and the professional to whom they are referred, who will then determine the appropriate time to perform extractions. The purpose of this article is to describe post-extraction changes in the tooth socket and suggest a protocol that is appropriate for defining when and how best to carry out tooth extractions in orthodontic patients.

Currently there is a significant increase the in demand for procedures associated with dental esthetics. Asa result, in recent years many systems have been developed for tooth bleaching through different forms ofapplication. Despite its widespread use, it has been argued that this process can alter not only the structure ofthe enamel surface, but can interfere with bonding procedures required to carry out orthodontic treatment.Different studies have showed that in patients receiving dental treatment clearance, adhesion processes arenot as efficient as those who did not.This article presents a literature review on the current state of tooth bleaching, and the relationship and / oreffect on orthodontic treatment when it is done before, during or after bleaching.Key words:Malocclusion angle class III, Bone anchor, Orthodontics. Actualmente se presenta un aumento importante de la demanda por procedimientos asociados a la estéticadental. A consecuencia de ello, en los últimos años se han desarrollado múltiples sistemas para realizar elaclaramiento dental por medio de diferentes formas de aplicación. A pesar de su amplio uso, se ha discutidoque dicho proceso puede alterar no solo la estructura de la superficie del esmalte, sino que puede interferiren los procedimientos de adhesión que se requieren para llevar a cabo un tratamiento de ortodoncia.Diferentes investigadores han realizado estudios que demuestran que, en los pacientes que han recibidotratamientos de aclaramiento dental, los procesos de adhesión no son tan eficientes como en aquellos queno lo recibieron.En este artículo, se presenta una revisión de literatura sobre el estado actual del aclaramiento dental, y la relacióny/o efecto que tiene en el tratamiento de ortodoncia, cuando éste se hace antes, durante o después del mismo.Palabras clave:Aclaramiento dental, Ortodoncia, Esmalte dental, Tags de resina, Adhesión.